India News : The issue of missing files relating to coalgate paralysed proceedings in Parliament on Tuesday with BJP demanding an immediate response from Prime Minister Manmohan Singh, even as the government said it will leave no stone unturned in tracing the documents.br br Amid cries of "shame-shame" and "pradhan mantri jawab do", Leader of the Opposition in Lok Sabha Sushma Swaraj raised the issue and said the Prime Minister should come to the House and assure members that the CBI probe will not be hampered due to the missing files.